Effects of maternal pulmonary exposure to carbon black (Printex 90) on gestation, lactation and DNA strand breaks were
evaluated. Time-mated C57BL/6BomTac mice were exposed by inhalation to 42 mg/m3 Printex 90 for 1 h/day on gestation
days (GD) 8–18, or by four intratracheal instillations on GD 7, 10, 15 and 18, with total doses of 11, 54 and 268 mg/animal.
Dams were monitored until weaning and some offspring until adolescence. Inflammation was assessed in maternal
bronchoalveolar lavage (BAL) 3–5 days after exposure, and at weaning. Levels of DNA strand breaks were assessed in
maternal BAL cells and liver, and in offspring liver. Persistent lung inflammation was observed in exposed mothers. Inhalation
exposure induced more DNA strand breaks in the liver of mothers and their offspring, whereas intratracheal instillation did
not. Neither inhalation nor instillation affected gestation and lactation. Maternal inhalation exposure to Printex 90-induced
liver DNA damage in the mothers and the in utero exposed offspring.